Year | Value | 2022 | 39.882 | 2021 | 39.207 | 2020 | 38.534 | 2019 | 37.861 | 2018 | 37.191 | 2017 | 36.522 | 2016 | 35.856 | 2015 | 35.193 | 2014 | 34.534 | 2013 | 33.878 | 2012 | 33.227 | 2011 | 32.58 | 2010 | 31.938 | 2009 | 31.301 | 2008 | 30.67 | 2007 | 30.043 | 2006 | 29.425 | 2005 | 28.814 | 2004 | 28.211 | 2003 | 27.936 | 2002 | 27.663 | 2001 | 27.391 | 2000 | 27.121 | 1999 | 26.853 | 1998 | 26.586 | 1997 | 26.321 | 1996 | 26.058 | 1995 | 25.796 | 1994 | 25.536 | 1993 | 25.251 | 1992 | 24.681 | 1991 | 24.119 | 1990 | 23.566 | 1989 | 23.021 | 1988 | 22.487 | 1987 | 21.959 | 1986 | 21.442 | 1985 | 20.933 | 1984 | 20.434 | 1983 | 19.943 | 1982 | 19.461 | 1981 | 18.988 | 1980 | 18.524 | 1979 | 18.068 | 1978 | 17.622 | 1977 | 17.184 | 1976 | 16.755 | 1975 | 16.334 | 1974 | 15.869 | 1973 | 15.411 | 1972 | 14.964 | 1971 | 14.526 | 1970 | 14.1 | 1969 | 13.751 | 1968 | 13.41 | 1967 | 13.074 | 1966 | 12.747 | 1965 | 12.379 | 1964 | 12.014 | 1963 | 11.657 | 1962 | 11.309 | 1961 | 10.971 | 1960 | 10.642 |
|